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Quatre chercheurs de l’Université de l’Ohio ont récemment publié une recherche montrant l’intérêt du CrossFit pour l’amélioration de la VO2Max et la perte de la masse grasse.

L’article, intitulé “Crossfit-based high intensity power training improves maximal aerobic fitness and body composition” et publié dans The Journal of Strength & Conditioning Research, teste les effets d’un entraînement basé sur le CrossFit, sur les capacités aérobiques et la composition corporelle (rapport masse grasse / masse maigre), chez 23 hommes et 20 femmes, en bonne santé, durant 10 semaines.

Les résultats publiés sont : 

  • Une amélioration significative de la VO2Max chez les hommes (43.10±1.40 à 48.96±1.42 ml/kg/min) et les femmes (35.98±1.60 à 40.22±1.62 ml/kg/min).
  • Une diminution du pourcentage de masse grasse chez les homme (22.2±1.3 à 18.0±1.3) et chez les femmes (26.6±2.0 à 23.2±2.0).

ABSTRACT: The purpose of this study was to examine the effects of a crossfit-based high intensity power training (HIPT) program on aerobic fitness and body composition. Healthy subjects of both genders (23 males, 20 females) spanning all levels of aerobic fitness and body composition completed 10 weeks of HIPT consisting of lifts such as the squat, deadlift, clean, snatch, and overhead press performed as quickly as possible. Additionally, this crossfit-based HIPT program included skill work for the improvement of traditional Olympic lifts and selected gymnastic exercises. Body fat percentage was estimated using whole body plethysmography and maximal aerobic capacity (VO2max) was measured by analyzing expired gasses during a Bruce protocol maximal graded treadmill test. These variables were measured again following 10 weeks of training and compared for significant changes using a paired t-test. Results showed significant (P<0.05) improvements of VO2max in males (43.10±1.40 to 48.96±1.42 ml/kg/min) and females (35.98±1.60 to 40.22±1.62 ml/kg/min) as well as decreased body fat percentage in males (22.2±1.3 to 18.0±1.3) and females (26.6±2.0 to 23.2±2.0). These improvements were significant across all levels of initial fitness. Significant correlations between absolute oxygen consumption and oxygen consumption relative to body weight was found in both men (r=0.83, P<0.001) and women (r=0.94, P<0.001), indicating HIPT improved VO2max scaled to body weight independent of changes to body composition. Our data shows that HIPT significantly improves VO2max and body composition in subjects of both genders across all levels of fitness.